.functions: Add fs

…and remove the `fs` alias from `.aliases`.

Ref. mathiasbynens#125.

.aliases

@@ -74,15 +74,6 @@ alias c="tr -d '\n' | pbcopy"
 # Recursively delete `.DS_Store` files
 alias cleanup="find . -type f -name '*.DS_Store' -ls -delete"
 
-# File size
-if stat -c '' . > /dev/null 2>&1; then
-	# GNU `stat`
-	alias fs="stat -c \"%s bytes\""
-else
-	# OS X `stat`
-	alias fs="stat -f \"%z bytes\""
-fi
-
 # ROT13-encode text. Works for decoding, too! ;)
 alias rot13='tr a-zA-Z n-za-mN-ZA-M'
 

.functions

@@ -3,6 +3,20 @@ function mkd() {
 	mkdir -p "$@" && cd "$@"
 }
 
+# Determine size of a file or total size of a directory
+function fs() {
+	if du -shb /dev/null > /dev/null 2>&1; then
+		local arg=-sbh
+	else
+		local arg=-skh
+	fi
+	if [[ -n "$@" ]]; then
+		du $arg -- "$@"
+	else
+		du $arg .[^.]* *
+	fi
+}
+
 # Use Git’s colored diff when available
 hash git &>/dev/null
 if [ $? -eq 0 ]; then